My suggestion is not to go backwards and use a combi lamp Anita because they are just not good in any way! The whole idea of them is a huge compromise.
In regards to what power of halogen I would suggest the 50 watt would probably be enough over a table of that size. Of course your ambient temp is also critical to this. Your basking spot will be small but I'm guessing its a small tortoise so that's ok.
If you were able to point your halogen in a side angle way, you might be able to get your basking spot under the peak uv area but I don't worry about this. The little uv flood will spread its light nicely across the area and I don't think the tortoise will be short on uv.
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Testudo Hermanni Hermanni (Corse) tortoises
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